1. (1) M. A. G. de Brito, L. P. Sampaio, G. Luigi, G. A. e Melo, and C. A. Canesin: “Comparative analysis of MPPT techniques for PV applications”, Proc. Int. Conf. Clean Elect. Power (ICCEP), pp. 99-104 (2011)
2. (2) A snapshot of top wind markets in 2017: GWEC Global Wind 2017 Report.
3. (3) H. Bevrani, A. Ghosh, and G. Ledwich: “Renewable energy sources and frequency regulation: survey and new perspectives”, IET Ren. Power Gen, Vol. 4, No. 5, pp. 438-457 (2010)
4. (4) M. Liserre, R. Cardenas, M. Molinas, and J. Rodriguez: “Overview of Multi-MW Wind Turbines and Wind Parks”, IEEE Trans. Industr. Electron., Vol. 58, No. 4, pp. 1081-1095 (2011)
5. (5) H. Bevrani: Robust power system frequency control, Springer Ltd.